t / t5100 / info0014on commit setup: set env $GIT_WORK_TREE when work tree is set, like $GIT_DIR (d95138e)
   1Author: Junio Hamano
   2Email: junkio@cox.net
   3Subject: BLAH ONE
   4Date: Thu, 20 Aug 2009 17:18:22 -0700
   5